Apex Porter Novelli worked with Unilever to launch the Lifebuoy 'School of 5' handwashing campaign in Kenyan primary schools. The campaign formed handwashing clubs in 83% of schools and collected over 1.7 million signatures from people pledging to wash their hands. Lifebuoy doubled its market share from February to October 2011. Popular singer Esther Wahome promoted the campaign and handwashing clubs were formed in most schools, significantly increasing children's handwashing rates and Lifebuoy's sales.